Cup-leather packing.



W. P. KRAUSE.

CUP LEATHER PACKING. APPLICATION F|LE0`APR.5. wals.

1,313,997. Patented Aug. 26,1919.

7mm/215m@ Jg MMM//mmwf i rangement for WILLIAM P. K RAUSE, OF CHICAGO,ILLINOIS, ASSIGNOR TO H ANNA ENGINEERING WORKS, OF CHICAGO, ILLINOIS, ACORPORATION OF ILLINOIS.

CUP-LEATHER PACKING.

Specification of Letters Patent.

Patented Aug. 26, 1919.

Application led April 5, 1915. Serial No. 19,284.

To all whom it may concern:

Be it known that I, VViLLIAM P. KRAUsn, a citizen of the United States,residing at Chicago, in the county o f Cook and State of Illinois, haveinvented certain new and useful Improvements in Cup-Leather Packing, ofwhich the following is a specification.

This invention relates to improvements in cup leather packinfr, and hasfor its principal object to provide a packin for a device of that naturewhich will per orm its functions eiliciently and which will be capableof use for a much greater period of time than those at present in use.

Another object of my invention is to provide in combination with apiston or the likeA cu i leather packing together with coacting e tainthe packing in its proper relation to the mechanism with which it isemployed and which will permit of its proper arrangement and functioningwithout destruction or unusual wear.

It is customary to provide cup packing of leather or the like, forattaclm'lent to the pistons or reciprocating members of pumps orcylinders, such as hoist cylinders, compresser pumps, and the like, toprevent leakage of air or other fluid past the piston. It is necessaryto provide or arrange this packing member in a cup shaped manner with aortion thereof lying alon and in Contact with the cylinder wall in w ichit. is located. It is also necessary to have a portion thereof angularlydisposed with respect to the remainder of the cup for attachment to thepiston, or the like. This ordinarily results 1n a sharp bent or groove.It is necessary, in order to maintain the first named portion of the cupin pro er contact with the cylinder wall, to provice some means formaintaining the cup in extended position at its bent portion. Hithertoit has been the practice to bend the same sharply around a corner oredge of the piston or follower, which results, in a short time, in thecutting or breaking of the cup at the bend. Other disadvantages alsoobtain in present day practice in the arextending the cup packin intoengagement with the cylinder wall, an to overcome these objections, andthose enumerated above, structure described in the followingspecification and shown in the accom ianying drawing, which is a sectionthrong `a porements which will atall times main# I have provided thetion of the cylinder and piston showing my improved packing appliedthereto.

Like numerals refer to like elements in the drawings, in which 1()designates a port1on ofthe cylinder. Reciprocably mounted in thecylinder is the piston 11 mounted on a piston rod 12 against a shoulder12'* to which it is-held by a nut 13, threaded on one end of a reducedportion 12b of the rod 12. This piston is rovided with the portion 11bof reduced diameter, for a purpose to be hereinafter described. Mountedon the rear face 11c of the piston is a cup packing member 15,preferably formed of leather or other flexible material having theportion 15 thereof lying on the rear face 11c of the piston, as statedabove. A follower ring or plate 16 tits around the reduced portion 11bof the piston and rests on the portion l5 of the packing member 15,serving to maintain the same tightly seated against the piston, aidfollower 16 being attachedI to the piston by threaded bolts 17, or thelike, as shown in the drawing. The packing member 15 is further providedwith the peripheral portion 15b bent to lie along and contact with theinner wall of the cylinder 10, as shown. It is necessary for the properand efficient functioning of the packing member 15. to provide means tomaintain the portion 15" pressed in contact with the cylinder wall, andfor this purpose I provide a split spring ring 18, shown as rectangularin cross section. This ring is formed of spring steel or cast-iron, orthe like, and is split to permit its acting as a spring ring, as is wellknown in engineering practice. This rin 18 serves to maintain a portionof the cu eather 15b closely pressed in contact with t e inner cylinderwall and is located around the outer periphery 16 of the follower 16,being retained in osition by means of the outwardly exten ing eripheralflange 16" thereof, as will be o vious. To provide an ample bearing orcontact surface of the packing member, and to maintain the portions 15and 15b thereof in proper angularly disposed relation, I provide asecond split lring 19, similar to the first, save that it is of arounded or curved cross section and thereforek presents a' curvedsurface located at and resting against the juncture 15 ofthe twoportions of the cup member 15, so that the portion 15" may be benttherearound to assume its proper relation With the cylinder wall. At thesame time the ring 19 will assist in maintaining it in such contactWhile presenting only av curved or rounded surface at its contact withthe cup 15, So that there is no sharp edge to cut into cup member 15, aswill be obvious.

It will be apparent that While the two rings may function independentlyand for slightly different purposes, they coperate to cause. the packingmember to properly functionin all necessary respects.

It will `be obvious that my invention is susceptible of modificationsand improvements', and I do not wish to be restricted to the form shownor described beyond the scope of 'the appended claims.

What I claim is:

1. In a device of the class described, a piston, a packing membercarried thereby, said packing member being provided with angularlydisposed portions, means to maintain one of said portions in contactwith a cylinder wall or the like` said means comprising an expansiblering having a rounded surface arranged to contact with the `juncture ofsaid angularly disposed portions of said packing member, and a secondexpansible ring located adjacent said first named ring and alsoconstructed and arranged to operate,independently of said first-namedrmg to maintain a portion of said packing member in contact with acylinder Wall or the like.

2. In combination, a' tion of reduced diameter, a packing member offlexible material having a portion thereof resting on one face of saidpiston and {itt-ing around said reducedportion thereof, a follower alsofitting around said reduced portion of said piston and attached to thelatter, said packing member being arranged with a portion thereof bentor disposed around said follower, an expansible ring located around saidfollower and operating to maintain the adjacent portion of said packingmember pressed outwardly, and a second expansible ring located aroundsaid follower at the juncture of t'he angularly disposed portions ofsaid cup member, said second ring having a rounded surface contactingwith said packing juncture and opera-ting independently of said.lirst-named ring.

In testimony whereof I have subscribed my name.

IVILLIAM P. KRAUSE. IVitnesses:

ARTHUR F. JENSEN, PHILITUS W. GATES.

piston having a poru member at such

